MCP4231T-104E/ML Microchip Technology, MCP4231T-104E/ML Datasheet - Page 38
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MCP4231T-104E/ML
Manufacturer Part Number
MCP4231T-104E/ML
Description
IC POT DGTL DUAL 100K SPI 16QFN
Manufacturer
Microchip Technology
Specifications of MCP4231T-104E/ML
Package / Case
16-QFN
Taps
129
Resistance (ohms)
100K
Number Of Circuits
2
Temperature Coefficient
150 ppm/°C Typical
Memory Type
Volatile
Interface
SPI Serial
Voltage - Supply
1.8 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Resistance In Ohms
100K
Number Of Pots
Dual
Taps Per Pot
128
Resistance
100 KOhms
Wiper Memory
Volatile
Digital Interface
Serial (SPI)
Operating Supply Voltage
2.5 V, 3.3 V, 5 V
Supply Current
1 mA
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Supply Voltage (max)
5.5 V
Supply Voltage (min)
1.8 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
MCP413X/415X/423X/425X
5.2
Each tap point (between the R
connection point for an analog switch. The opposite
side of the analog switch is connected to a common
signal which is connected to the Terminal W (Wiper)
pin.
A value in the volatile wiper register selects which
analog switch to close, connecting the W terminal to
the selected node of the resistor ladder.
The wiper can connect directly to Terminal B or to
Terminal A. A zero-scale connections, connects the
Terminal W (wiper) to Terminal B (wiper setting of
000h). A full-scale connections, connects the Terminal
W (wiper) to Terminal A (wiper setting of 100h or 80h).
In these configurations the only resistance between the
Terminal W and the other Terminal (A or B) is that of the
analog switches.
A wiper setting value greater than full-scale (wiper
setting of 100h for 8-bit device or 80h for 7-bit devices)
will also be a Full-Scale setting (Terminal W (wiper)
connected to Terminal A).
wiper setting map.
Equation 5-2
mine the resistance between the wiper and terminal B.
EQUATION 5-2:
TABLE 5-1:
DS22060B-page 38
7-bit Pot 8-bit Pot
3FFh
081h
080h
07Fh
041h
040h
03Fh
001h
000h
Wiper Setting
N = 0 to 256 (decimal)
N = 0 to 128 (decimal)
R
R
Wiper
WB
WB
=
=
illustrates the calculation used to deter-
3FFh
0FFh
101h
100h
080h
07Fh
000h
081
001
R
------------- -
(
R
------------- -
(
256
128
AB
AB
VOLATILE WIPER VALUE VS.
WIPER POSITION MAP
N
N
)
)
+
+
R
Reserved (Full-Scale (W = A)),
Increment and Decrement
commands ignored
Full-Scale (W = A),
Increment commands ignored
W = N
W = N (Mid-Scale)
W = N
Zero Scale (W = B)
Decrement command ignored
WB
R
R
W
W
Table 5-1
CALCULATION
Properties
8-bit Device
7-bit Device
S
illustrates the full
resistors) is a
A POR/BOR event will load the Volatile Wiper register
value with the default value.
default values offered. Custom POR/BOR options are
available. Contact the local Microchip Sales Office.
TABLE 5-2:
-502
-103
-503
-104
100.0 kΩ
10.0 kΩ
50.0 kΩ
5.0 kΩ
DEFAULT FACTORY
SETTINGS SELECTION
© 2008 Microchip Technology Inc.
Mid-scale
Mid-scale
Mid-scale
Mid-scale
Table 5-2
8-bit
Wiper Code
80h
80h
80h
80h
shows the
7-bit
40h
40h
40h
40h